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discus changing pattern

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Hi...
two of my discus, the pigeon and the blue diamond changed their patterns. The lines/stripes of the pigeon have turned into dots and, the blue diamond now have firm dark frame on both above and low fins. I really wish to be able to attach their recent images on this message so that you'll have your own opinion about what I mean.
Anyway, any responds will be much appreciated...oooops and my question is : Are they normal?

I don't know much about discus, but from reading other threads this sounds to me like peppering. Google it.

This is copied from another forum:

Dark backgrounds and substrate do not cause it, but will bring it out as will stress. Peppering is a result of genetics. It is a characteristic shared by all Pigeon Blood discus. It is a dominant trait and first generation crosses will all look like pigeons. Pigeon Blood discus do not have the black vertical bars on them like some other discus do. Instead of being aligned in bars, the black pigment is spread throughout the body, which is why the fish have little black spots or "pepper" all over them. The pepper becomes more prominent when the fish are excited or stressed just like bars on non-pigeon blood discus show during these times. Lightening up the background and substrate may lighten the peppering but it will not all disappear. If a PB has pepper then it has it permanently, however there are things that can be done to reduce this, and in some cases to almost non existent amounts. First and foremost high water quality, second a light background and substrate, and third a proper diet. Bright lights can even be enough of a stressor to bring more of the peppering out.

I agree with firefly, the pigeon blood seems to be peppering but this might also be related to what is happening to the blue diamond.

The blue diamond on the other hand seems to be getting darker around the edges if I understand you correctly? If that's the case it may be an early and pretty prominent indicator of stressful conditions and/or poor water quality.

I advice you start a large daily water change regiment for 1 week to see if there is any improvement while ensuring the tank is at the appropriate temperature and the new water matches that of the tank.

Yes, it seems the Pigeon Blood is peppering, likely due to darker surroundings in your tank, i.e. background & substrate.

And Mojo's comments about the Blue Diamond may be correct too, although the darkening finnage might possibly be a non-stress related ancestral/genetic lineage factor emerging as the fish matures, and gets its full coloration - and this could be enhanced by darker surroundings of the tank, in the same way it's causing peppering in the PB.
I've seen several blue diamonds with almost total charcoal-colored fins, with a light blue center body.

When a blue diamond gets quite stressed, it is generally evidenced by the entire body turning a smokey/dusty darker blue/purplish.

Another potential option is the Blue Diamond is reaching adult coloration and is of high quality. If this is the case, high quality blue diamons get whats called a "Halo" on the outter inch of their finnage. Its a sign of dominance and maturity.

If you are talking about the Pigeon Blood moving from Straited to dotted, as in there is a breakage of the lines as the fish matures, you could be seeing the mature genes coming out in the fish as well. Peppering is little black dots on the head and face of the fish which (as stated) is due to a dark background.

I thank you all for your comments. It's been 3 months since i asked you the question, and now my discus are (in my opinion) OK. Due to peppering, i now keep the lights on during nights, i think it is the best i can do to reduce the effect of dark background of my aquarium. And i've changed frequently the water once a week. The bars on the discus appears less than before, as result. I also attach a heater in the filtration tank to keep the water temperature as warm as they want. Their upper fins erect firmly now. I dont know if you guys can see the picture or not, but i attached 1 and it says it is uploaded by tapatalk.

The heater has more to do with the barring than the light. I would go back to normal photoperiods. Discus pepper mostly due to bad water quality. I would need much better pics unfortunately to really let you know much more. My screen has this as pixelated so I cant make an educated decision on the fish.